Investigate how to remove dependency of OpenCV

[nikos-livathinos]

The OpenCV is a dependency for docling-ibm-models(https://github.ibm.com/DeepSearch/docling-ibm-models), where it is used to load and resize images for the TableFormer model.

Here are the places where opencv is called:

• tableformer/data_management/functional.py:resize()
• tableformer/data_management/tf_predictor.py:resize_img()
• tests/test_tf_predictor.py:test_tf_predictor()

Additionally in order to correctly evaluate the effect of replacing opencv with another image library, we should measure the impact at:

• TableFormer input tensors (image loading, normalization, resizing).
• TableFormer output predictions.